WOLF TOOTH WOLFCAGE DERAILLEUR CAGELETTING THE WOLF OUT OF THE CAGEShifting and chain wrap are among the most important things while you're out on your mountain bike. The Wolf Tooth WolfCage Derailleur Cage is a modified inner derailleur cage and the eccentric upper jockey wheel for Shimano 11-speed rear derailleurs that improves chain wrap and derailleur capacity. This is required for 11-49-tooth cassettes and also improves shifting and drivetrain life on other wide-range cassettes. It installs in a couple of minutes and simply replaces the stock inner cage and upper jockey wheel. There is also no need to break your chain or remove your rear derailleur from the bike.FeaturesCompatible only with Shimano 11-speed rear derailleursIncludes the inner cage and the upper pulley and eccentric bearingDesigned to work with 11-49T cassettes | Wolf Tooth WolfCage Derailleur Cage Shimano XT-GS